After quarterback Colin Kaepernick, tight end Vernon Davis is probably the most recognizable member of the San Francisco 49ers—if not for his Pro Bowl ability and eight-year tenure with the team, then at least for his incredible 6’3″ 250-pound physique.

However, the human brain, with all its amazing power to reason and deduce, is usually pretty easy to fool. Give a famous person a wig and a hat and put them in an unexpected location, and even their biggest fans will second guess themselves.

Such was the case recently when Jamba Juice invited Davis to spend a day working at one of their Santa Clara locations, incognito. Though a number of fans felt something was a little off when they were served by a giant physical specimen supposedly named Sycamore(no really, Sycamore), few were willing to trust their instincts and call the man by his real name.

Take a look:

That Vernon Davis is a character, isn’t he?

Now if you’ll excuse me, I’m going to go have a smoothie. (Effective marketing, Jamba Juice.)